Cat Years to Human Years Calculator

Convert cat years to human years with the AAFP / International Cat Care veterinary guideline — 1 year ≈ 15, 2 years ≈ 24, then +4 per year.

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Formula

Cat aging (AAFP / International Cat Care guideline): the first year ≈ 15 human years, the second year adds 9 (≈ 24 total), and each year after that adds about 4. Cats mature fastest in the first two years, then age much more slowly than dogs

Examples

InputResult
6 cat years≈ 40 human years
1 cat year≈ 15 human years
14 cat years≈ 72 human years

Frequently Asked Questions

How do cat years convert to human years?

The veterinary guideline (AAFP / International Cat Care): a 1-year-old cat ≈ 15 human years, a 2-year-old ≈ 24, and each additional year adds about 4. So a 6-year-old cat is roughly 40 in human years.

Is the cat aging curve the same as the dog curve?

No. After the second year a medium dog adds about 5 human years per year and breed size matters a lot; cats add about 4 and vary much less by breed. The old ×7 rule is a myth for both species.

When is a cat a senior?

Cats are considered mature at 7–10 (≈ 44–56 human years), senior at 11–14 (≈ 60–72), and geriatric at 15+ (≈ 76+). Senior cats benefit from twice-yearly vet checks and bloodwork.

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